Mulch keeps getting sucked up by my mover around trees. Stone around trees???

I'm looking for an easy way to keep my mulch around my trees. My mower is super powerful and in 2 months the mulch is just about gone around my trees.I saw this and am wondering if anyone has used it? http://www.yardproduct.com/product_i...roducts_id=758I'm looking for an easy way to do this, and this just pound in with stakes!

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I had the same problem around my flower beds. I had a curb around it, but that di not help much. I replaced my mulch with red granite. Does not blow away, will last a heck of a lot longer, and looks much better